"Inexpensive does not mean cheap (at least in this case)"4.5 starson by forkboy
Pros: $80!!! Very, very low distortions
Cons: All cheap plastic construction, tad slow focus at large apetures
Summary: My first prime lens purchased due to it's f/1.8 abilities. Yes; it's all plastic and it's not a nice plastic. Yes, it was only $80 brand spanking new. Yes, it looks more like a wart than a lens on my Canon 40D.
It takes very sharp pictures (center=excellent and borders=very good). It focuses quickly under most circumstances, but is a bit noisier than the USM lenses from Canon. It's a lens for full-frame cameras so vignetting isn't an issue even at f/1.8.
Long story short: it rocks.